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M. l. WOHL AND H. HERTZB'ERG.

ARC LAMP.

. APPLICATION FILED )UNE I4, 19H3.'

,51ML 0x.

HT'TOR/VEY n M. J. woHL 4AND H. HERTZBERG.

y Anc LAMP.

APPLICATION FILED IUNE I4. i918.

1,394,876; 'Patented o@ 25, 1921.

, 2 SHEETS-SHEET 2- /N vE/v Tof? s;

UNITED STATES PATENT OFFICE.

MAURICE J. wein. AND HARRYIHERTZBERG, or NEW YoRx, N. Y., AssIGNoRs TOM. J.

woHL AND COMPANY, 1Nc.,`A-coRroR.AT1oN or NEW YORK.

ARC-LAMP.

yTo all whom. t may concern:

Be it known that MAURICE J. WOHL -and HARRY HERTZBERG, citizens of the United States, and residents of Brooklyn, county arc lamp in which the carbons are laterally offset from the control mechanism;

More specifically, the invention has for an object to provide van improvedarrangement and construction of the support or mounting for the movable carbon, whereby the support is maintained in rolling contact with its guides and carries the carbons in an offset position. fp

For further comprehension of the invention and of the objects and ladvantages thereof, reference will be Ahad to the following descriptionv and accompanying drawings describing and illustrating one embodiment of the invention, and to the appended claims in which the; novel vfeatures of theinvention are set forth. i

Figure 1 of-the vation of an are lamp embodying `the invention. y

Fig. 2 is a horizontal section on the line 2-2 of Fig. 1.

Fig. 3 visla rfragmentary vertical section on the line 3-3 of Fig. 1.

Fig. 4 is an enlarged detail horizontal section on the line 4-4 of Fig. 3.

As here shown, the frame of my improved arc lamp comprises the top and bottom castings 1 and 2, and an intermediate plate 3. The plate 3 is rigidly connected to the bottom casting 2 by the vertical posts 4 located at the corners of the frame. The plate 3 is also rigidlyconnected to the top casting 1 by the vertical posts 5, which are equally spaced in pairs on opposite sides of the median line of the lamp, as shown in Fig. 2; these posts 5 serving also as guides for Specification of Letters Patent.

drawings is a side ele- Y `Patented Oct. 25, 1921.

Application led June 14, 1918. Serial No. 239,947.

the carbon carrier, as will be presently pointed out. f

Carried by the top casting 1 is a solenoid 6, which may be secured in position by any suitable means. yThe core 7 of the solenoid is connected to a dash pot 9 through a resilient yoke 10, the dash pot being supported on a horizontal bar 11 carried by the-vertical rods 12, which are attached at their upper ends to the casting 1. The resilient yoke 10 kcarries a cross bar 13 to which are connected the upper endsof the rods 14 having clutches 15 of usual type attachedto their lower ends. `The mounting of the solenoid 6 and dash pot 9 `and the construction and connection of the resilient yoke 10, cross bar 13 and rods 14 ma all be arranged as shown and described 1n a revious Patent Nog'. 1,235,271, issued to aurice J. Wohl, one of the applicants herein, on July 31, 1917. Further description of these parts is, therefore, not given here. f

The clutchesil engage vertical rods 16,

' which are located between the respective pairs of the posts 5, and are longitudinallyadjustable. These rods are rigidly secured at their upper ends, as by the nuts 17, to brackets 18 to vwhich are fixed the lateral armsr 19 carrying the uppery carbon holders 20thearms 19 `being insulated from the brackets 18, as indicated at 21. The arms 19l extendin a direction to position the corresponding carbon holder and posts in a com,

mon plane, as will be apparentfrom Fig. 2.

of-posts 5 are the pivoted rollers22 which are slightly smallern diameter than thedistance; between the respective posts of each pair.

As shown most clearly in Fig. 2, the brackets 18 extend along the posts 5 on one side thereof and are `provided with supplementary strips 188L which extend along the opposlte sides of the posts, thus preventing lateral displacement of the rollers 22.

The rods 16 extend downwardly through suitable apertures in the plate 3 into tubes 23, fixed to the plate 3 at their upper ends and which may extend through the bottom casting 2 at their lower ends.l as shown in Fig. 3. Pivoted in the lower end of each of the rods 16 is a pair .of rollers, 24 and 25, arranged one above the other and at right angles to one another, as clearly shown 1n Figs. 3 and 4, the diameter of these rollers being slightly less than the interior diameter of the tubes.

The holders 26 for the fixed carbons may be carried by lateral arms 27 secured to and insulated from depending lugs 2S formed integral with the plate 3. While only one of these holders for the fixed carbon is shown in the drawings, it will be obvious that there will be one in vertical alinement with each of the carbon holders 20.

It is not considered necessary to illustrate the electrical connections, which may be through the solenoid, down one pair of carbons, through the resist-ances (indicated at 29 as depending from the plate 3) and up through the other pair of carbons, the insulated arms 27 forming the medium for connection to the carbons.

The arrangement of laterally offset carbons serve various purposes and have several advantages in arc lamp construction. In the present instance they provide for the use of the reflector, indicated in dotted lines at 30 in Fig. 1, which may be secured in place in any suitable manner and provided with the necessary vertical slots toaccommodate the carbon mountings.

W'ith the arrangement here shown all danger of the movable carbon support failing to operate properly, by reason of its support binding or sticking is eliminated. As shown clearly in the drawings, the rollers 22, their guiding posts 5, the arms 19, carbon holders 2O and rollers 24; and 25 all extend in one general plane so that the lateral pressure is taken up directly by the rollers 22 and 25. By this arrangement any tendency of the clutches to pull the dummy carbons in a direction at right angles to the plane above referred to and to cause the supportsA to bind or stick is overcome and the carbon supports are maintained in rolling contact with the guides. This not only insures a more eflicien-J operation of the lamp mechanism but results in a steady light and absence of flicker. Also the arc adjusts itself quickly to changing conditions, both in starting and while in operation, and permits of satisfactory operation of lamps when tested.

vWhat we claim is 1. In an arc lamp, the combination with control mechanism including a clutch, of a carbon rod engaged by said clutch, a pair of posts disposed on opposite sides of said dummy carbon, a tube into which said carbon rod extends at its lower end, a bracket to which the carbon rod is attached at its upper end, an arm extending from said bracket substantially in a common plane with the said posts; a carbon holder carried by the said arm, and means for maintaining supports for the carbon rod inl rolling contact with said posts and the interior of the said tube.

2. In an arc lamp, the combination with control mechanism including a clutch, of a carbon rod engaged by said clutch, a pair of guide members for the upper end of said carbon rod disposed on opposite sides thereof, a roller carried by the upper end of the carbon rod between the said guides, a pair of' rollers carried by the lower end of the carbon rod and having their axes at right angles to one another, and a guide for the lower end of the carbon rod having guiding faces positioned and adapted to be engaged by said rollers.

3. In an arc lamp, the combination with control mechanism including a clutch, of a carbon rod engaged by said clutch, a pair of posts located on opposite sides of said carbon rod, a. bracket to which the upper end of said carbon rod is attached, an arm eX- tending from said bracket substantially in a common plane with the said posts; a carbon holder carried by said arm, a roller pivoted to said bracket and positioned between the said posts, a tube into which said carbon rod extends at its lower end, and a pair of rollers pivotally carried by the lower end of said carbon rod and having their axes at right angles to one another.

Signed at Brooklyn, county of Kings, city and State of New York, this 31 day of May, 1918.

MAURICE J. WOHL. HARRY HERTZBERG. 

